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convection baseboard heating issues in house with mix of 1/2in and 3/4in pipes
Hi, I'm having problems with my baseboard heat. House is built in 1960's 3 floors. There are 3 loops but they are not organized by floor. 1 loop for the basement, for the 2 other floors one loop covers the east half and the other covers the west half. Heat hasn't worked properly since I moved in 2 years ago.
The basement was finished more recently, so they installed the 3/4in pipes as per code. The upstairs loops have 1/2in pipe. it's all 1 zone with the thermostat on the second floor. The basement gets hot, the east loop is luke warm in the bedroom but barely warm in the living room below it, the west loop is completely cold.
I've hired 3 plumbers already. One tried bleeding at the return, didn't fix it. The next guy bled the system at the return, and at the purge valves for each of the 3 loops. These loops don't have isolation valves though so I can't bleed loops individually. Also tried bleeding at the baseboard. Got a little heat in west half but then got cold again and couldn't get it warm after. The last guy, a master plumber, took one look at my utility closet and said I needed an air scoop (he didn't look at anything else, he didn't even turn on the system to test, never went upstairs to see how the plumbing was organized. All together I've paid about 1000 so far and nothing has changed.
I'm wondering if it's possible the hot water just keeps cycling around the basement loop due to the larger cross section area and lower elevation? If I have the heat on and the west half is cold, if I open the bleed valve to a baseboard, it does start to warm up as the pressure loss forces the water into that loop. But as soon as I close the valve, it goes back to the way it was.
Sorry for long reply and lack of pictures, I can post those later.